Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 490: | \[{8^{490}-1\over7}\] | 32 × 72 × 11 × 31 × 43 × 71 × 127 × 151 × 211 × 281 × 331 × 337 × 491 × 1471 × 5419 × 5881 × 29191 × 41161 × 86171 × 106681 × 122921 × 152041 × 664441 × 748819 × 1564921 × 4163041 × 20147473081<11> × 2340389488711<13> × 4363953127297<13> × 4432676798593<13> × 27653710336343911<17> × 15162868758218274451<20> × 26032885845392093851<20> × 2741672362528725535068727<25> × 50647282035796125885000330641<29> × 252359902034571016856214298851708529738525821631<48> × 631430922992211190033830999202698905758039480236241<51> × 23618256244840618857212522155851714598259422753496906641681177748710460515038403366198473773770441<98> |